Signaling system.



No. 7n,|a2. I Patented on. I4, 902'.

H. SHUEMAKER. SIGNALING SYSTEM.

(Application filed Sept. 6, 1902.)

(No Model.)

% by. I 7 JENVENTORf WMLZS M ATTORNEY.

UNITED STATES PATENT OEEIcE.

HARRY SHOEMAKER, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CONSOLIDATED WIRELESS TELEGRAPH AND TELEPHONE COMPANY SIGNALING SYSTEM.

$PEGIFICATION forming part of Letters Patent No. 711,182, dated October 14, 1902. Application filed September 5, 1902.1 Serial No. 122,176 (No model.)

system wherein high-frequency oscillations at the transmitter cause the radiation therefrom of electroradiant energy which influences and controls the apparatus at the receiving-station.

My invention relates more specifically to improvements at the receiving-stations of a wireless signaling system, whereby the received electroradiant energy is caused to con trol local circuits to produce signals or messages.

My invention comprises a receiverof a wireless signaling system in which the received radiant energy is caused to influence the magnetism existing in a magnetic mass, causing it to be moved to control local circuits.

My invention comprises means whereby electroradiant energy is caused to demagnet ize a normally magnetized mass, thereby releasing it to the control of a magnetic field and resulting in the opening or closure of a local circuit or circuits for producing electrical signals.

My invention comprises means for demagnetizing a magnetized rod or needle or bundle of needles pivoted very delicately in the field of a permanent magnet or electromagnet and surrounded by a winding through which pass oscillatory currents generated in the receiving-conductor by the received electroradiations. These oscillations, as is well known, demagnetize wholly or in part the pivoted member, which is then controlled by the field in which it is located and rotates slightly upon its jeweled bearings and in so doing controls a circuit or circuits which produce a signal and also again magnetize the pivoted member preparatory to receiving a further code character in the form of a train of oscillations.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a diagrammatic view showing the moving magnetized member and the permanent magnet producing the field in plan View. Fig. 2 is the same as Fig. 1, except that the permanent magnet and the pivoted member are shown in side elevation.

In Fig. l, A represents the usual aerial conductor at the receiving-station of a wireless signaling system, and E represents the usual earth connection. Connected in series between A and E is the winding D, surrounding but not interfering with the motion of the needle C, which is composed, preferably, of a small bundle of very fine steel wires. The memberC is pivoted by means of a vertical pivot F, as shown in Fig. 2, in jewel bearings G G. Extending from the pivot-pin F and at approximately right angles to the axis of member C is the member II. The member H extends rearwardly'to the screw-threaded member J, upon which is the counterpoiseweight K, which by rotary motion is adjusted along the screw-threaded member J.

c e are stops which limit the rotary motion of the member C.

I is a contact which cooperates with the member H to close the local circuit inclu ding source of energy a and the relay R.

Mis a permanent magnet whose poles are represented, respectively, by N S. The line joining the centers of the poles N S forms an acute angle with the member C, as clearly shown in Fig. 1, and passes through the pivotal support E. In place of the permanent magnet M may be used, of course, an electromagnet. The winding D'is common also to the circuitincludingchoke-coilfirelay-tongue j, relay-contact a, source of energy 1), recorder B, and choke-coilf'.

The method of operation is as follows:

When electroradiant energy impinges upon the aerial conductor A, there are set up in i the circuit A D E oscillations which then demagnetize the permanently-magnetized memneutral and is then attracted by the magnet M and immediately rotates upon its pivotal support, and in consequence of this rotation the member H comes into contact with I, closing the circuit of the relay E. This relay then closes the circuit at contacts 0 (1, producing a record, either audible or visible, in the recorder B and at the same time passes a current through the solenoid or Winding D in such direction as to so remagnetize the member C that it will be repelled by the magnet M. The apparatus is then in condition for the reception of the next train of oscillations.

It is to be understood that the member 0 may be opposed during its period of repulsion by the magnet Mth at is, just before receiving oscillations-by a spring, so that upon demagnetization, which need not in such case be entire or complete demagnetization, the spring will cause the rotation of member 0 upon its pivotal support to close the circuit H I. In fact, this is the preferred arrangement.

It is to be understood that instead of magnetizing the member O'by means of the winding D, through Which oscillations are received, a separate winding may be employed, which should be controlled by relay R at the proper moment. This Would be perfectly apparent to one skilled in this art.

The flexible connection to the member H may and is preferably through the pivot-pin F, because of the very slight motion of the periphery of such pin; Such flexible connections may be made by a very fine helical conductor or by means of a very fine weak flat spiral hair-spring, as is common in galvanometer instruments.

From the foregoing description it is apparent that by the use of a magnetic field in the vicinity of the magnetized needle I am enabled to produce a motion of the member 0 with even the weak effect of received oscillations, and therefore my system is more effect- We for long-distance signals than heretofore possible with demagnetizing systems.

What I claim.is-

1. In a wireless signaling system, a magnetic field, a normally magnetized member in said field, means for demagnetizing said member by the effect of received electroradiantenergy, and means for producing a signal due to the motion of said member in said ma netic field.

2. In a wireless signaling system a field of force, a normally magnetized member supported in and capable of rotation in said field of force, means for changing the normal magnetism of said member by the effect of received oscillations, and a local circuit controlled by said member.

3. In a wireless signaling system, a field of force, a normally magnetized member supported and rotatable in said field of force, a winding for demagnetizing said member by the effect of received oscillations, at local circuit controlled by said member for producing a signal and for restoring said member to its normal magnetic condition.

4. In a wireless signaling system, a magnetic field, a normally magnetized member delicately pivoted in said field, a winding for demagnetizing said member by the eifect of received oscillations, a local circuit controlled by said member, and a recording device in series with said winding.

'5. In a wireless signaling system, a receiving-conductor, a magnetic field, a normally magnetized member supported and movable in said field and under the influence of a Winding, a local circuit controlled by said member and a recorder in series with said winding and a source of energy.

6. In a Wireless signaling system, a magnetic field, a normally magnetized member supported and movable in said field, a winding for demagnetizing said member under the influence of received energy, a relay-circuit controlled by said member, and a circuit in-. cluding a source of energy, a recorder and said winding, controlled by said relay.

7. In a wireless signaling system, a normally magnetized member capable of movement, means for demagnetizing said member by the effect of received oscillations, and a local circuit controlled by said member.

8. In a wireless signaling system, means for maintaining a magnetic field, a normally magnetized member supported and movable in said field, a local circuit controlled by said member, and means for changing the degree of magnetization of said member.

9. In a wireless signaling system, means for maintaining a magnetic field, a normally magnetized member movable in said field and repelled thereby, means for changing the repulsive force by received energy, and a local circuit controlled by said member.

10. In a Wireless signaling system, means for maintaining a magnetic field, a normally magnetized member supported in and repelled by said magnetic field, means for demagnetizing said member by the eifect of received electroradiant energy, and means for producing a signal by the resultant motion of said member.

11. In a Wireless signaling system, a normally magnetized member delicately pivoted, means for demagnetizing said member by the ICC efiect of received electroradiant energy, a for demagnetizing said member by the effect magnet normally repelling said member, and of the received energy, and a local circuit conto a local circuit controlled by said member. trolled in virtue of the decreased repulsive 12. In a wireless signaling system, a norforce. 5 mally magnetized member, means for main- HARRY SHOEMAKER.

taining a magnetic field about said member, Witnesses: said member located in said field in a manner E. B. HUME,

to be normally repelled thereby, a Winding, CHAS. J. FOREMAN. 

